# Chapter 7 - Algebraic Fractions - Chapters 1-7 Cumulative Review Problem Set - Page 324: 5

$20$

#### Work Step by Step

Substituting the values $x=-6$ and $y=4$ into the expression and then simplifying, we obtain: $x^{2}-y^{2}$ =$(-6)^{2}-(4)^{2}$ =$36-16$ =$20$

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